Have seen this problem with the following options set.

OS: Solaris 8
 JVM: 142_02
 params used

 -server -Xms3500m -Xmx3500m -XX:NewSize=1750m -XX:MaxNewSize=1750m
 -XX:SurvivorRatio=19 -XX:+UseParNewGC
 -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=35 -XX:+CMSParallelRemarkEnabled -XX:PermSize=26m

 and
 -server -Xms3500m -Xmx3500m -XX:NewSize=1750m -XX:MaxNewSize=1750m
 -XX:SurvivorRatio=19 -XX:+UseParNewGC
 -XX:+UseConcMarkSweepGC -XX:MaxLiveObjectEvacuationRatio=20 -XX:+CMSParallelRemarkEnabled -XX:PermSize=26m

Error:
Unexpected Signal : 11 occurred at PC=0xFEDA5828
Function=[Unknown. Nearest: JVM_GetFieldIxModifiers+0x1E64]
Library=/export/enterprise-docs/dataciti/j2se/1.4.2_02/jre/lib/sparc/server/libjvm.so
.
.
.
#
# HotSpot Virtual Machine Error : 11
# Error ID : 4F530E43505002EF 01
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Java VM: Java HotSpot(TM) Server VM (1.4.2_02-b03 mixed mode)